中文摘要：

通过平面二维水沙数学模型,论证三洋港挡潮闸闸下引河的开挖型式,计算引河开挖后泥沙冲淤量及对行洪的影响.结果表明：闸下开挖一条宽120m,底高程-3.5m的引河不能满足行洪6400m^3/s的要求.通过分析滩地糙率的敏感性,对比不同开挖长度和高程的引河的行洪计算结果,最终确定闸下引河开挖型式为与闸室等宽、长度2.2km,左侧底高程-1.0m,右侧0m的方案.引河开挖后,遇枯、中、丰水年,闸下泥沙淤积量分别为181000,121000和36000m^3.连续3个枯水年,闸下累积淤积量约50万m^3,遇设计流量时三洋港闸下水位抬高0.12m,当淤积量超过此时累积淤积量,闸下需进行清淤,以确保行洪的安全.

英文摘要：

A 2D numerical model is used to simulate flood level in the demonstration of an approach channel excavation scheme and its sedimentation after excavation of the Sanyanggang floodgate. Research results show that the channel having 120 m in width and -3.5 m in elevation depth can not fit the flow of 6 400 m^3/s. Beach roughness sensitivity is analyzed, and several excavation schemes of the downstream approach channel with different lengths and elevations are calculated in this paper. According to the results above, a proper excavation scheme is： width equal to lock chamber, length of 2.2 km, the left beach elevation of - 1.0 m, and the right of 0 m. Amounts of sediment in the downstream channel in three typical years of being dry, normal and wet are 181,000 cubic meters, 121,000 cubic meters and 36,000 cubic meters. If three continuous years are dry, the siltation volume is about 500,000 cubic meters. In this condition, water level will rise by 0.12 m when encountering flood discharge of 6 400 m^3/s. In this moment, sediment dredging is necessary.